An eighth grader. One who has five more years of school to go. Namely used at Boston Latin School, and the fivesies love to taunt and tease the sixies because they were teased as sixies. GO WOLFPACK!!!!!!!

Fivesie: Hey did you know you gotta chose a second language in eighth grade?
Sixie: NOOOOOOOO! I'm already failing English and Latin!!!!!!!!